Technical Bulletin July 2009 Nonin® MedAir™ Capnography Technology is Consistently Accurate Across Challenging Breathing Conditions INTRODUCTION Figure 1: Product Comparison – Accuracy Current standards for evaluating accuracy of capnographs NoninNonin RespSense RespSense EtCOEtCO2 vs NICONICO (N-364)(N=364) includes simple, steady flow gas validation in which a known 60 percent gas is delivered to the device. Such testing does not allow evaluation of the effects of complexities due to breathing 55 and diseased lungs. This study sought to create a more complex 2 50 system to evaluate device performance in conditions which better represented realistic patient conditions. 45 40 METHODS 35 Resp EtCO2 To evaluate the accuracy of Nonin’s MedAir™ end-tidal CO 30 2 Bias: 0.2 technology across challenging breathing conditions, data 25 Arms: 2.6 was collected from the RespSense™ Capnograph with Nonin Nonin RespSense EtCO 20 MedAir EtCO2 technology and from an internationally known 20 25 30 35 40 45 50 55 60 competitor device (Competitor A). Both devices were compared ® NICO against the Philips Respironics NICO Mainstream EtCO2 monitor, a mainstream capnograph chosen for comparison due Root Mean Square Error 2.563916 Mean of Response 0.178683 to its accepted accuracy. CompetitorNellcor EtCO A EtCO2 vs2 NICOvs NICO (N=364) (N-364) 60 To compliment the findings of the simulation testing, an additional 55 test was performed at a constant flow of 5% CO2—a value required in medical device testing standards1—in order to 50 validate the accuracy of the devices at a static CO2 level. 2 45 The tests were performed in a controlled laboratory setting using 40 a Michigan Training Test Lung (TTL). The TTL chamber was 35 Nellcor EtCO2 insufflated with CO2 and ventilated with a Draeger Medical, Inc. 30 or Puritan Bennett ventilator. Settings were adjusted to simulate Bias: -4.8 appropriate CO2 output and upper airway flow/leak dynamics of Competitor A EtCO 25 Arms: 5.5 various clinical models, including Restricted, COPD, Normal, 20 Obstructive, COPD-Obstructed, Infant, and Child. Respiratory 20 25 30 35 40 45 50 55 60 rates from 6 to 82 breaths per minute were tested to evaluate NICO device performance in changing environments. Root Mean Square Error 5.485858 1ISO 21647:2004 Medical electrical equipment – particular requirements for the basic safetyMean and of essential Response performance of respiratory gas monitors.-4.82019 Technical Bulletin RESULTS Figure 2: Mean EtCO2 by Device • Nonin’s MedAir side stream technology consistently Bias = -4.8* performed as well as the mainstream technology across all 40 simulated disease models and the range of respiratory rates. 39.4 39.2 35 • Nonin’s MedAir side stream technology performed 34.4 30 significantly better than Competitor A’s side stream device 2 25 (Accuracy as compared to mainstream: Nonin 0.2 mmHg O bias; Competitor A –4.8 mmHg bias) (See Figure 2). 20 • The superior accuracy of the Nonin’s MedAir side stream Mean EtC 15 technology compared to the competitor side stream 10 technology was also noted with 5% CO2 constant flow gas test (See Figure 3). 5 0 Nonin Mainstream Competitor A CONCLUSION * Statistically significant difference between devices in mean EtCO2 (paired t-test, p-value <0.05). Data set includes those observations where NICO EtCO2 <60 mmHg. Nonin’s MedAir EtCO2 technology, with its stable optical bench, is as accurate as the mainstream EtCO2 reference and significantly more accurate than Competitor A. Nonin’s MedAir technology provides accurate information in a wide range of simulated patient models and disease states. Figure 3: Accuracy Compared to Reference 5% CO2 at Various BPM 5% (39 mmHg) CO2 45 Competitor A Nonin 40 Reference CO2=39 mmHg 35 30 25 mmHg 20 15 In addition to the simulated tests, a calibration test was 10 performed by administering 5% CO2 (39 mmHg) at 5 respiration rates of 20 to 60 breaths per minute. 0 20 40 50 60 Breaths Per Minute Nonin Medical, Inc. 13700 1st Avenue North, Plymouth, MN 55441-5443, USA Phone: +1 763.553.9968 | Toll Free: 800.356.8874 | Fax: +1.763.553.7807 | Email: [email protected] www.nonin.com All trademarks are the property of Nonin Medical, Inc. unless otherwise noted. ©2009 Nonin Medical, Inc. M-4608.